Wczoraj taksówkarz znał dobry skrót, więc taksówka przyjechała na dworzec wcześniej.

Polish word order is fairly flexible, so Wczoraj is placed first to set the time frame right away: Yesterday.

Starting with the time expression is very natural in Polish, especially when you want to establish the context before giving the main information.

You could also say:

• Taksówkarz wczoraj znał dobry skrót...
• Taksówka przyjechała wcześniej na dworzec...

But those versions shift the emphasis. The original sentence sounds natural and neutral.

Because taksówkarz is the subject of the first clause, and subjects are normally in the nominative case.

Here:

• taksówkarz = the taxi driver → subject
• znał = knew

So taksówkarz znał means the taxi driver knew.

If it were taksówkarza, that would usually be an accusative or genitive form, and it would not fit as the subject here.

This is a very common learner question.

In Polish:

• znać = to know, be familiar with
• wiedzieć = to know a fact, to be aware that...

So:

• znał dobry skrót = he knew a good shortcut / he was familiar with a good shortcut
• wiedział would be more natural for facts, for example:
  • Wiedział, że droga jest zamknięta. = He knew that the road was closed.

You use znać with things like:

• people
• places
• routes
• ways
• songs
• languages

A shortcut is something you are familiar with, so znał skrót is correct.

Because skrót is the direct object of znał, and here it is a masculine inanimate noun.

For masculine inanimate nouns, the accusative singular is usually the same as the nominative singular.

So:

• nominative: dobry skrót
• accusative: dobry skrót

That is why the form does not change.

Compare with a masculine animate noun, where the accusative would change:

• nominative: dobry kierowca
• accusative: dobrego kierowcę

But skrót is inanimate, so it stays dobry skrót.

Here skrót means shortcut.

Be careful, because skrót can also mean abbreviation in other contexts.

For example:

• dobry skrót do dworca = a good shortcut to the station
• skrót słowa = an abbreviation of a word

In this sentence, because we are talking about a taxi and arriving earlier, the meaning is clearly shortcut.

Więc means so, therefore, or thus.

It connects the two parts of the sentence:

• the driver knew a good shortcut
• so the taxi arrived earlier

In standard Polish spelling, a comma is normally used before więc when it links clauses.

So:

• Taksówkarz znał dobry skrót, więc taksówka przyjechała...

This is similar to English punctuation in a sentence like:

• The driver knew a good shortcut, so the taxi arrived earlier.

Because taksówka is a feminine noun, and Polish past tense agrees with the gender of the subject.

The subject in the second clause is taksówka = taxi, which is feminine.

So the past tense form is:

• przyjechała = feminine singular past

Compare:

• taksówka przyjechała = the taxi arrived
• samochód przyjechał = the car arrived
• autobusy przyjechały = the buses arrived

Even though a taxi is an object, its grammatical gender still controls the verb form.

Polish often allows either the driver/person or the vehicle to be the grammatical subject, depending on what you want to emphasize.

So both ideas are possible:

• taksówkarz przyjechał na dworzec = the taxi driver arrived at the station
• taksówka przyjechała na dworzec = the taxi arrived at the station

In this sentence, the focus is on the taxi reaching the station earlier, so using taksówka sounds natural.

English also does this sometimes:

• The taxi arrived early.

This is an important preposition pattern.

With dworzec (station), Polish commonly uses:

• na dworzec = to the station (motion toward it)
• na dworcu = at the station (location)

So:

• przyjechała na dworzec = it arrived at / to the station

Even though English often uses to, Polish uses na here.

This is similar to other destination expressions:

• na pocztę = to the post office
• na lotnisko = to the airport
• na uniwersytet = to the university

Meanwhile, do is used with many other places, but not all:

• do domu = to home
• do sklepu = to the shop

So this is something you often just have to learn as a phrase: na dworzec.

Yes, the form looks the same, but the case is different in function.

After na with motion, Polish uses the accusative case.
The noun dworzec is masculine inanimate, and in the singular its accusative is the same as its nominative.

So:

• nominative: dworzec
• accusative: dworzec

That is why you do not see a visible change.

Compare with another noun where the form does change:

• na stację = to the station
  because stacja is feminine:
  • nominative: stacja
  • accusative: stację

Wcześniej means earlier or sooner.

In Polish, as in English, you do not always have to say exactly earlier than what if the context makes it obvious. Here it means something like:

• earlier than expected
• earlier than usual
• earlier than they would have arrived without the shortcut

So wcześniej works perfectly well even without an explicit comparison.

It comes from:

• wcześnie = early
• wcześniej = earlier

Both verbs are in the past tense, but they differ in aspect, which is a major feature of Polish verbs.

• znał is imperfective
• przyjechała is perfective

Why?

• znał describes a state: the driver knew a shortcut
• przyjechała describes a completed event: the taxi arrived

So the sentence combines:

1. a background state or circumstance
2. a resulting completed action

This is very natural in Polish.

A rough way to think about it:

• znał = he had that knowledge
• przyjechała = the arrival happened and was completed

Possibly, but the meaning or style would shift.

• przyjechała = arrived by vehicle; very natural here
• dojechała = reached the destination after traveling; also possible in some contexts
• przybyła = arrived, but more formal or literary

Since a taxi is a vehicle, przyjechała is the most natural everyday choice.

Examples:

• Taksówka przyjechała wcześniej. = very natural
• Taksówka dojechała wcześniej. = possible, with a slight focus on reaching the destination
• Taksówka przybyła wcześniej. = grammatical, but less conversational

Yes, it is natural and clear.

It has a very normal structure:

• Wczoraj = time
• taksówkarz znał dobry skrót = cause/background
• więc = result connector
• taksówka przyjechała na dworzec wcześniej = result

A native speaker would understand it immediately.

If someone wanted, they could make tiny stylistic changes, for example:

• Wczoraj taksówkarz znał dobry skrót, więc na dworzec taksówka przyjechała wcześniej.

But the original version is smoother and more neutral.